Before stripping down to remove the carbs etc. I prefer to do the following.
Remove the air filter.
Then open the throttle to open the butterfly valve in the carb.
Then while turning the motor with the starter spray so flammable spray into the air box.
You can use almost any flammable spray from Quick Start to deodorant to Doom

If you have spark it will start to run or sound as if it wants to run.
If it remains as dead as a doornail you know your problem is not fuel but spark related.
You first need to pin point the problematic system and then you start to tackle the problem. Just blindy stripping stuff is a sure fire way to waste alot of time.